refactor: consolidate formatting utilities and add testing infrastructure

- Replace 8 duplicate formatCurrency functions with shared utility
- Add comprehensive formatter utilities (currency, date, number, etc.)
- Set up Vitest for unit testing with 38 passing tests
- Set up Playwright for E2E testing
- Consolidate database connection to single source (src/utils/db.ts)
- Add auth middleware helpers to reduce code duplication
- Fix display bug: remove spurious minus sign in recent activity amounts
- Add path aliases for cleaner imports ($utils, $models)
- Add project documentation (CODEMAP.md, REFACTORING_PLAN.md)

Test coverage: 38 unit tests passing
Build: successful with no breaking changes

src/routes/mario-kart/[id]/+page.server.ts

@@ -0,0 +1,43 @@
+import type { PageServerLoad } from './$types';
+import { error } from '@sveltejs/kit';
+import { dbConnect } from '$utils/db';
+import { MarioKartTournament } from '$models/MarioKartTournament';
+
+export const load: PageServerLoad = async ({ params }) => {
+	try {
+		await dbConnect();
+
+		// Use lean with flattenMaps option to convert Map objects to plain objects
+		const tournament = await MarioKartTournament.findById(params.id).lean({ flattenMaps: true });
+
+		if (!tournament) {
+			throw error(404, 'Tournament not found');
+		}
+
+		console.log('=== SERVER LOAD DEBUG ===');
+		console.log('Raw tournament bracket:', tournament.bracket);
+		if (tournament.bracket?.rounds) {
+			console.log('First bracket round matches:', tournament.bracket.rounds[0]?.matches);
+		}
+		console.log('=== END SERVER LOAD DEBUG ===');
+
+		// Convert _id and other MongoDB ObjectIds to strings for serialization
+		const serializedTournament = JSON.parse(JSON.stringify(tournament));
+
+		console.log('=== SERIALIZED DEBUG ===');
+		if (serializedTournament.bracket?.rounds) {
+			console.log('Serialized first bracket round matches:', serializedTournament.bracket.rounds[0]?.matches);
+		}
+		console.log('=== END SERIALIZED DEBUG ===');
+
+		return {
+			tournament: serializedTournament
+		};
+	} catch (err: any) {
+		if (err.status === 404) {
+			throw err;
+		}
+		console.error('Error loading tournament:', err);
+		throw error(500, 'Failed to load tournament');
+	}
+};